Calculating-machine.



D. E. FELT.

CALCULATING MACHINE.

APPLICATION FILED APR. 5, 1913.

Patented Sept. 9, 1913.

8 SHEETS-SHEET 2.

.00 rfif'felt D. E. vFELT.

CALCULATING MACHINE. APPLICATION um APR. s, 1913.

Patented Sept. 9, 1913.

B SHEETS-SHEET 3.

D. E. FELT.

CALCULATING MACHINE.

APPLICATION I'ILED APR. 5, 191a.

Patented Sept. 9, 1913.

8 SHEETS-SHEET 4.

ll Q D. E. FELT.

CALCULATING MACHINE.

APPLICATION FILED APR. 5, 19,13.

"j mm Se t 9, 1-913;

8 SHEETS-SHEET 5.

D. E. FELT. CALCULATING MACHINE.

D. FELT. CALCULATING MACHINE.

m g 1 .9 b p 8 S d 8 t m a 8 SHEETS-SHEET 7.

fave/Liar:

flu 1 216 712 47 216 40W 16- wig 5.

D. E. FELT.

CALCULATING MACHINE.

APPLICATION FILED APR. 5, 1913. P 1,072,933. a nted Sept.'9,1913.

8 SHEETS-SHEET 8.

r: n f

m m M Q UNITED s'rA'rns PATENT onnron.

mm. a. FELT, or oHIcAeo. rumors.

CALCULATING-MACHINE.

novaoes.

' Specification of Letters Patent. Application filed April 5, 1913. Serial No. 759,191.

Patented Sept. 9, 1913.

I To all whom. it may concern 7 among others, my prior U. S. Patents Nos.

762,520 and'762,521 ofJune 29, 1904;; No. 767,107 of Aug. 9, 190 1; No. 960,528 of June 7, 1910; No. 992,950 of May 23, 1911; No. 996,009.0f June 20, 1911; Nos. 982,416 and 982,417 of Jan. 24; 1911; No. 1,003,723 of Sept. 19, 1911; and No, 1,028,344.- of June 4,

The invention has for its objects to provide normal and incidental safety locks against mis-manipulation of the finger keys and erroneous results arising therefrom; in-.

cluding locks for the keys, for the actuators of the accumulator mechanism, for the accumulator mechanism and for other parts. And the invention has for further objects the efiectingof all other improvements instructure or function that may be found to obtain in the mechanism hereinafter described or claimed.

In order to make the invention more clearly understood I haveshown in the accompanying drawings means for carrying the same into practical efi'ect, withoutlimiting my improvements, in their useful applications, to the particular constructions which, for the purpose of explanation, I have'delin'eated.

In the said drawings Figure 1 is a plan view of a calculating machine embodying the invention. Figs. 2 and 3 show a side view of the same, on a lar or scale, looking at the machine from the right side. Fig. 4

is a longitudinal vertical section, partly in elevation, of a portion of the same, on line 4:4 of/Fig. 1. Fig. 5 is a longitudinal .vertical section showing in elevation the locking mechanism. Fig. 6 is an elevation of the locking mechanism detached, with a ke depressed. Fi 6 shows pawl 137 engage Fig. 7 is a ngitudinal vertical section,-

showing in elevation the canceling mecha-' nism at the left sideof the machine in its normal position, but viewed from the right side of the machine. Fig. 8 is a similar elevation of parts of the canceling mechanism detached, 1n their position when the canceling actuator or handle has been thrown rearward. Fig. 9is a horizontal section, partly broken away, on line 99 of Fig. 11, with the ,top plate and part of the mechanism removed. Fig. 10 is a'plan view, partlybroken away, with in horizontal section, and showing at a lower cross section, partly broken away, on .line 11-11 of Fig. 2, some of the parts being omitted. Fig. 12 is a vertical cross section of a part of the machine on line l212 of Figs. 13, 14 and15 are detail views, in vertical cross section, respectively on lines 13 13, 14 14 and 15-15, of Fig. 2,-showing parts of the locking mechanism. Fig. 16 is a plan View, partly in horizontal section, showing parts of the canceling mechanism. Fig. 17 is a front view of the oiling. device.

' Referring to the drawings, l'indicates the of the frame of the machine, and 2 the top plate thereof. The frame preferably-comprises verticalside or retaining plates, such as are shown at 1, and similar intermediate plates one of which is arranged in each of the spaces between the numeral wheels 3. All of these vertical plates are secured to or maybe rigidly connected by suitable cross bars or tie rods 4, and by the top plate 2.

The accumulator mechanism, including tional series of finger keys mounted to reciprocate vertically in guide apertures or bearings in the top plate 2, and the lower end of each key stem is pressed upward by a lever 5 and spring 6 carried by lower frame parts 7.

tain of the parts, and their functions, known in and by the prior patents above mentioned; but it is not-necessary to an explanation of the present improvements to repeat all of the description and illustration of said patents. The principal parts are the following: Column actuators or segment levers 8 yieldingly held up by accumulator actuating springs 10'; odd andeven stop levers --ll;, 11',- 1,2, 12' each of which may comprise trror'seps pivotally mounted at 9 on the frame 1-, and

the to 3 plate removed, showing frame parts level parts that are omitted from Fig. 9 for the sake of elearness. Fig. 11 is a vertical 1 Fig. 2, some of the parts being omitted.-'

vertical retaining plates constituting a 'part' mounted on a base (not shown) andare or the numeral wheelsis caused tobe actuated, in the calculating operation, by denomina- For'convemence I will recapitulate cer- I arate co-acting parts, as shown, and which are pivoted to the rear and front. of the frame at 13,14; stop detents 15, 16., carried by the lever parts 11, 12, to engage with the coarse spaced teeth 17 a on the column actuator and arrest the downward movement of the latter; accumulator pinions 18 mounted on the cross pivot accumulator shaft 19 and engaged and turned by the column actuators; accumulator ratchets 20 fixed to the pinions 1S; lantern wheels 2-1 having pawls pivoted thereon and arranged withinthe ratchets, whereby the ratchets turn backward freely but on their forward movement rotate the lantern wheels by means of the said pawls; a back stop pawl 22, and a locking detent 23, for each lantern ,wheel' the lockin detents bein salin 7 b D D "meshin with and drivin carryin gears D s O on the cross pivot carrying shaft 29; carrying motor springs encircling the shaft 29 and connecting the carrying gears yieldably with rotary escapements 30 on the shaft 29: twoarmed carrying cams 31'fixed on the said escapement and given, by means of the said carrying motor springs and escape- 'ments, a half revolution at each half revo-' lution of the carrying gears or whole revolution of the carrying pinions; carrying levers 32 each of which is pivoted on the cross pivot shaft or rod 33 and is arranged in line with the lantern wheel in the next higher order of accumulator mechanism, said carrylng levers being raised by the carrying cams at each half revolution of the latter; carrying pawls 34 pivoted, as are the locking detents, on the carrying levers and operating on the pins of the said next higher lantern wheelto move the latter and its accumulator mechanism one step at each carry; carry-detaining'latches 35 to enable .twq keys in contiguous orders to be simultaneously depressed without losing a carry; cam-actuated three armed detents 36 for locking the carrying leversz and canceling stops 37 for positioning the accumulator mechanisms and numeral wheels in canceling, mounted on a rock bar- 38. a

The machine'is of the duplex type; that is to say, two, keys side by side, in different orders, maybe simultaneously depressed and each will have its proper and full effect in the accumulation. To this end the carrying mechanism isadapted to permit prime actuations of the accumulator mechanism in a plurality of orders simultaneously. That such full effect of the'depression of the key of lower order be attained it is necessary that any carrying, which may be due to take place from the lower numeral wheel to the higher numeral wheel, shall not be lost by reason of the higher numeral wheel having such forward motion that the carrying mechanism may not affect it. The latch 35 is pivotally mounted on the cross rod 39 of the frame and extends over the carrying mechanism, resting at its inner or rear end.

on the stud pin 40 of the column actuator 8, The latch has a tooth 41 which is adapted to either (whichever may first encounter it) of the two projections 42 on the rotar hub or sleeve of the carr in mechanism. When any key of the order to which a carry is to be made is struck the actuator 8 of that column and its'pin 40 move down, allowing the latch 35 to drop where its tooth 41 may engage a projection 42 and arrest any rotation of the carrying'devices which might at that time be ineffective. The carrying devices continue to be so held until the column actuator 8' rises, and the key and numeral wheel of the higher order have completed or substantially completed their operation, whereupon the pin 40 lifts the latch 35, and releases the carrying mechanism, and allows the latter to be actuated by its carrying spring to effect the proper carry which may be due to occur. The carrying mechanism of each column or order is provided with a set 'of the described parts 35, 40, 41.

43 is the latch releasing device, preferably a swinging release bar which releases the latches 35 and connected carrying mechanisms and over-wound carrying motor springs. It is formed with arms 44, 45 pivoted vto the frame on the cross rod 39 and is arranged to engage the tail pieces 46 of the latches 35 at a point below the pivot cross rod 39 of the latches and force them backward to lift the latch teeth 41.

46, 46 indicate links which pivotally connect with the arms 44, 45 of the release bar at 47 48 above the pivot rod 39 and connect with the forward ends of release levers 49, 49 at 50. These release levers, one at each side of the machine, are pivoted to the frame at 51. The canceling means, whereby the numeral wheels are reset at zero, comprises a cancelingactuator, or cancellation controlling means, consisting in this instance of a crOSs rocksh'aft- 52, crank handle 53 and slotted cam 54. These parts operate on a canceling device comprising a'segment lever 55 actuated by the slotted cam; a canceling pinion 56 on the canceling or intermediate shaft 25; and means by which said shaft may retat'ethe intermediate gears 24 when the shaft is in a certain position relative to the gears. The canceling means also comprises devlces effecting a one-space adding moveator.

under side of'- stops gonna:

ment of. the column actuators, consisting of a transverse bar 57 adapted to depress the column actuators one space and give a onespace adding movement to the accumulator mechanism, which bar is reciprocated vertically by the slotted cam through the medium of arms 58, which carry the bar at their ends and are pivoted at 51 to the frame 1, and by the lifting springs 7 7 All of these parts are or may be similar to those set forth in my said patents.

In some of my said patents special stops, acting only during cancellation, were provided for the column actuators in order that they might be arrested when depressed sufficiently to give a one-space adding movement on rising. According to the present invention such special stops are dispensed with, and I employ for the purpose the same column actuator additive stops or detents 15 which arrest the actuators during accumulation. This is done by a modification in the relation of the canceling cross bar and one of the stop levers in each column. These parts are so constructed that the cross bar will depress the stop lever to osition its stop detent for a onespace ad ing movement of the column actu- The cross bar may have downward projections to engage all of the stop levers, but I prefer the construction illustrated, in which the stop lever 11 in each .column is formed or provided with an upward projection 59. The cross bar encounters this projection early in the canceling operation (Fig. 5) and positions the detent 15 forthe said one-space adding movement which then occurs in said operation.

T he canceling operation -For accuracy in bringing the numeral wheels from their various positions all to the 0 position, those of the second and higher orders are first brought to the 8 position and the units Wheel is brought to the 9 position; then the cross bar 57 and the column actuators having been depressed, rise and move all of the wheels one step, the wheels of higher order than units to the 9 position and the units wheel immediately after to the 0 position, the said movement of the units wheel being detained in a knownmannor by a slightly elongated tooth 61 on its canceling stop 37, and causing the carrying mechanisms to operate, successively but practically instantaneously, across the machine from right to left to bring the said wheels of higher order to the 0 position and complete the canceling operation.

60 indicates stop studs, one on each of the carrying pinions 2-8, which may engage the 61.011 canceling stop levers or arms 37. The latter are afiixed to the transverse, canceling stop rock bar 38 mounted to oscillate in the lower part of the frame. When the steps 61 are rocked forward into the paths of the stop studs 60 they are adapted to arrest the carrying pinions 28 in such position that each numeral wheel of higher order than units is held positively in the 8 position, the

units wheel stopping at the 9 position by reason of a little later (36 degrees) positioning of its stud 60 on its pinion.

- Referring to Figs. 7, 8 and 16 the former of which shows the parts located at the left side of the machine but which are viewed from the right side of the machine, 62 is an arm extending from the rock bar 38 and having afiixed thereto a pin 63. This pin is engaged by a jaw 64 at the forward end of a lever 65 pivoted at 51 to the frame of the machine. 66 i; a spring connecting the lever 65 with the frame of the machine and acting to pull the forward arm of the lever, and

the rock bar arm 62, backward and downward and the rear arm of the lever upward. 67 is a stop on the frame which limits such movement of the lever. 68 is a link pivoted at 69 to the rear arm of the lever and at 70 to the rear stop arm 71 of a bell lever, which is pivoted at 7 2 to the fraine and has a forward cam arm .73 formed with a cam 74. The bell lever is adapted to be turned forward until the pivot point 7 0 passes the straight line of the points 69 and 72 and the arm 71 engages the rear side of the link 68, or other suitable abutment, whereupon the parts form a togglelock against the pull of the spring 66, and, the rear arm of the lever 65 having been depressed by the described movement of the parts 71 and 68, hold the canceling stops 61 in the paths of the carrying pinion stop studs 60. The said arms 58 which carry the canceling cross bar. are formed with cams 7 5 which are depressed by dolly i-olls 76, 76'.

at each side of the machine, which rolls'are connected with and oscillated by the-cancel ing shaft 52.

The bell lever is turned forward as above described by the dolly roll 7 6 at the left of the machine, which on the backward movement of the canceling handle operates on the cam 74: as well as on the cam of the left arm 58 above mentioned. When the canceling handle lever 53 is turned forward and the dolly roll backward the said dolly roll 7 6 leaves the cam 74; but the parts 71, 68 and 65,..remain in their toggle locked position,

with the stops 6]. in engagement with the studs 60, until the lever 53 reaches its forward normal position and the dolly roll presses upward and backward slightly on the link 68 (see dotted lines in Fig. 8)

Thereupon the link 68 is turned over backward and the pivot 69 carried forward across the toggle line, the toggle lock is broken and the spring 66 instantly restores the parts to the position shown in Fig. 7 and releases the stops 61 from the carrying. pinlons, and

from the accumulator mechanism connected with said pinions. In the construction illustrated this instantaneous tripping of the parts occurs at substantially the end of the operative part of the return or forward movement of the canceling actuator 53, and this is the time preferred for such tripping. At substantially the same time the column actuator cross bar 57 is raised by the springs 77 and the column actuators 8 rise and cause the numeral wheels to be turned one step, which, with the final carrying, effects the cancellation or zeroizing.

I will first-describe the key lock, one in each column, and of an ordinal character, which normally prevents the simultaneous depression and operative actuation of keys in different columns by one finger lof the operator: The keys are each made in two parts one of which is depressible relative to the other, the central finger button 78 being fixed on a spring tube 7 9 which has a vertical sliding engagement with the key stem 80. The upper part of the key stem is formed or provided with wings 81 at the sides of the button, so that when a finger of the operator falls between. two keys in different contiguous columns, or partly on both of two such keys, the finger pressure will be on the wings and stem and not sufficiently on the button of either key to fully depress its button and spring tube relative to the stem. Unless the button be fully or sufliciently depressed the key or keys will remain locked in their normal elevatedpositions. The preferred locking means for this purpose, and lock releasing means, as illustrated, are the following: 82 is a hook with which each column actuator 8 is formed or provided, and with these hooks are engaged corresponding swinging hooks 83 pivoted on a cross rod 84 fixed in the -frame. Since the key stem engages the top of the column actuator by a shoulder or projection 85 the key cannot beoperatively depressed till the hooks 83 have been swung forward out from under the actuator hooks '82. 86 is an auxiliary lever, one for each column, arranged at the side of the column actuator and pivoted on the same cross rod 9 which forms the pivot for all of the col umn actuators. It is formed on its upper edge, as by projections 87, to be properly engaged by'the lower ends of the spring key tubes 7 9, so that when the key button is sufficiently depressed the auxiliary lever is depressed inadvance of the column actuator. The auxiliary lever is further provided with a lateral projection 88 which rests on the horizontal forwardly extending arm 89 of an elbow lever 90 pivoted at 91 on the column actuator. The elbow lever has an inner vertical arm 92 which is connected by a spring 93 with the actuator, so that the elbow lever is normally pulled back into vertical position with its horizontal arm bearing up against the auxiliary lever projection 88; it also has an outer Vertical arm 9 1 which is connected by a pivot 9a with a forwardly extending link 95. The pivot is fixed on the arm 94 and the link receives the pivot in a horizontal slot 95, which allows a slight forward and backward yielding of the parts, the rear end of the slot being normally pulled closely against the pivot by a spring 96. Then the auxiliary lever is depressed by the spring tube of a key it causes the arm 94 of the elbow lever to rock forward on the actuator and thrust forward the link 95 yieldingly pivotally supported at 84 on the frame and limited in movement by a fixed cross rod 100 which enters a vertical slot 101 in an arm 102 of the said links. The links carry a pin 98' which extends outward at the rear side of the actuator-locking hook 83, so that the forward thrust of the link 95 disengages the hook from the corresponding actuator hook 82. When such disengagement occurs in the column in which the depression of a key has been properly begun, the actuator of that column is free to be depressed when its top edge is encountered by the lateral shoulder or projection 85 on the key stem, and the key and stem are free to follow the actuator downward. In this movement the lateral projection or shoulder 85 of the key stem encounters the proper stop lever, 11 or 12, according to whether the key is odd or even, and depresses it, and thereby properly positions the stop detent 15 or 16, to arrest the actuator at the proper degree of depression to have on the accumulator mechanism, when the actuator rises, an additiye efi'ect correspondingwith the designation on the key.

Following, is described the accumulator lock, one in each column, which incidentally and automatically locks the accumulator during normal key action except while the-additive function is being performed: The pin 97 carries a forwardly and backwardly, and upwardly and downwardly, movable part, such as a lever 103 pivoted thereon between the links 98, the links being yieldingly pressed backward and the forward arm of the lever upward by a spring 10-1- which connects said parts. The forward end of the lever is also pressed upward by a spring 105 which unites it withthe fixed cross rod 100. The forward end of the lever is provided with a pin 100 which enters the slotted arm 107 of an accumulator detent 108 pivoted on the fixed .cross pivot rod 109, the arrangement being invests such that the upward and downward movement of the front arm of lever 103 and the arm 107 of the detent will respectively engage and disengage the detent .with and from the lantern Wheel 21 or equivalent engageable part of the accumulator driving mechanism. I When the said detent engages the lantern wheel it and its accumulator mechanism are locked against rotation, and it is necessary to remove the detent when and as the additive function of the actuator is performed. The detent 108 is or may be normally out of engagement with the accumulator (Fig. 5), but the first downward movement of the key spring tube causes the pin 106 to be thrust forward in the slot of the detent' arm 107, and when the actuator is then depressed by the key stem it allows to move down a lateral arm 1 1 0 fixed on the rear arm of the lever 103 and extending over and normally held up by the actuator. The forward arm of the lever, being normally pressed upward by the. springs 104 and 105, now rises and throws the detent 108 into engagement with the accumulator wheel 21 (Fig. 6). When the actuator is at or near the bottom of its depression the detent 108 is removed from the accumulator wheel by the action of a side projection 112 (111 in case of the odd lever) on the side of the stop detent lever element 12, which projection depresses the lever 103 at the front end and tilts the detent out from the accumulator wheel. The lever 103 carries forward with it, in its downward and forward rocking movement, an arm 113 having a lateral projection 114. 115, 116 is a lever pivoted on a cross pivot rod 117 fixed in the frame and having its inner (right) arm withthe column actuator and provided with a lateral projection 118 which bears down ward on the actuator and is released as the actuator moves downward; and having its outer (l'eft)"arm 1:1-5 arranged in the path of the projection 1 14. This lever is yieldingly pressed forward and downward by a spring 119. Just 'as the detent 10S comes out of the accumulator Wheel the arm 115, which is resting on the projection 114, is allowed, by the forward tilting of the arm 1:13, to drop behind said projection; which looks the detent 108 in its disengaged position, leaving the accumulator free to be turned in the immediately ensuing adding operation. There isv a further means for locking the accumulator det-ent out of the lantern Wheel, comprising a latch 120 which hooks under the lateral arm 110 of the lever 103 while the actuator is coming up, and is sdheld by a spring 121. This prevents the lever 103 from tilting to throw the detent 108"-into engagement, and it'so remains till the actuator is nearly up. An arm 122 of the latch rests on the fixed 116 arranged parallel.

cross rod 51 to limit the backward position of the latch, under the pull of spr ng 121, relative to the arm 110. As the actuator arrives at its highest position, and with it the auxiliary lever, the lateral outward projection 88 on the auxiliary lever lets up the arm 89, and the link and lever 103 move backward carrying the arm off from, and slightly below the point of the latch 120. The detent 108 is now out of the lantern wheel. It is not locked out but is spring-held out by the upward ressu-re of the actuator under arm 11 0. hen any key is partially depressed, and released, the spring 6 at the bottom of its stem will throw it, up, but the actuator starting to turn the accumulator mechanisms, turns. a pin of the lantern against the detent 1 08 (which has been thrown into the lantern as above described), which arrests the accumulator against forward turning and holds down the actuator, preventing aocu-mulation, and the error is signaled by the locking of the other actuators and keys, ashoreinafter described.

On the initial depression of a key, as above described, when the lever 103 moves forward, the arm 110 encounters the latch on the point of its book and forces. it forward slightly and follows down (as the rear arm of the lever 103 tilts downward under pull of springs 1'04, 105) along the incline of the hook of the latch, thus e s caping being looked up. When from this position the arm 110 is tilted upward it'displaces the latch forward, and the spring 7 121 returns the latch under the to hold itup.

I will now describe the lock for actuators in other columns when a key is partially d'epressed and released. .When a key is partially depressed and released the forward end of lever 103 is elevated and so held by. springs 104 and 105, as above described. 011

the release of the keythe actuator remains the accumulator being held from down,

the detent 108; but the auxiliary turning by lever 86 rises and lets up the arm 89, and the spring 93 pulls back the link 95 and lever 103, and the rear end 123 of the lever encounters and thrusts backward the square shaft 124 hung by arms 125 from'the rock bar 126. The rear arm of the lever 103 is limited in its downward movement by the cross rod 51-, and in so acting on the shaft no 124 it may slide rearward on said rod. This squareshaft extends across and is common to all of the columns, and is adapted to be thus engaged by the lever-103 of each column. On this movement a hook 127 (Fig. 7), formerly resting on the top of the shaft 124, drops down, allowing rock shaft 128, to which the hook is attached,-to turn with it under the pull of the springs 119 through the media of the hook tails 131 130 locks are released. 1 Complete depression of the key formerly partly depressed will give the accumulation intended in its order, and thereupon the actuator of this order rises' and is also looked up, its hook 133 having deflected backward, and then interlocked with, the swinging hook 132. All keys in all orders may be now released by depressing the release key 134, which bears on cross rod 135 in the rear arms 136 of the rock bar 128, and throws up the hook 127, allowing the square shaft 124 to swing forward to a position under the end of the hook, thereby holding up the hook ready for a new locking operation in case another key be partly depressed. Before the correction, by completely depressing the key formerly partly depressed, the operation of the release key will not release permanently all of the keys, because the shaft 124 is now in its rearward position and will not support the hook 127 and the hooks 132, 133 will reengage assoon as the release key 134 comes up. Shaft 124 is held rearward by the end 123 of lever 103. While the release key is held down by hand all of the keys ma be individually pressed down, but all will e relocked on rising unless the release key be kept down. Several keys may be partially depressed at the same time. The operator may be conscious of I error as to one of them and may correct, as

above described. But on touching the release ke 134 it will not sta down and columns 0 keys remain locked: The operator then knows that more than one key was partially depressed, and by feeling the key board (having in mind the number intended proper key depression.

to be registered) he can detect the partially depressed key, and fully depress it. Only after all partially depressed keys have been completely depressed can the locked columns of keys be unlocked.

Under a sharp quick stroke on a key the auxiliary lever 86 might get ahead of the actuator in rising or returning to "normal, and. the latch 120 might fail of its locking function by reason of the lever 103 moving rearwardly to carry the arm 110 off from the la'tch,'which would allow the lever to thrust bagk the shaft 124and lock the keys after a But the arm 115 acts early in falling behind the projection 114 to, hold" the lever 103 from backward 'movement, and the latch 120 retains its hold of the lever longer, whereby the lever is until the key stem and the key button have- I risen to normal position. a

When a key button is depressed, and before it positively engages and forces the key stem downward, it first compresses the key spring and also extends the spring 96 by reason of the movement of the auxiliary lever relative to the columh actuator; 'just after the stretching of the spring 96 begins the springs 104, 105 begin to be extended, and then the spring 121. The key stem then begins to be depressed, and the tension of springs 104, 105 is relieved. Just before the key stem reaches its bottom limit of depression the springs 104, 105 are again extended as the front end of the lever 103 moves downward. The spring pressures successively encountered in depressing the key button, and those which increase as the whole key descends to the bottom of its stroke, both cushion the key button to the finger of the operator and diminish the shock of the final stopping of the key.

Following is a descriptionof the upstroke lock which operates when a key has been fully depressed and is attempted to be re-depressed without letting'it all the way up: 137 is a pawl pivoted at 109 to the frame and adapted to engage the exterior of the ratchet 20 for the accumulator. It is pulled toward'the ratchet by aspring 138 which connects the pawl below its pivot with a part of the detent 108. pawl is limited by a fixed cross rod 139 situated in a slot 140 of the pawl. The pawl has an offset arm 141 which is on or over the rearwardly extending arm 107 of the detent. lVhen a key is being depressed the said detent arm is at such a height that 'it holds up the pawl arm 141 and keeps the pawl clear of the ratchet, but'when the key as been completely depressed the detent arm is carried downward and the pawl engages the ratchet under the influence of its spring. The key may now be released or allowed to return normally, and the ratchet will turn forward by the operation of the actuator, the ratchet teeth smoothly trip ping the pawl. But if the operator press down again on the key while it is coming up, and without'waiting for it to complete itshstroke, the pawl immediately engages a ratchet tooth and causes the accumulator to be locked against forward turning by the.

key and an erroneous accumulation and the key is locked against further depression, and the operator is compelled to let the key rise completely without having made an error. 142 is a rock bar pivoted at 143 to the frame. It carries a series of rearwardly extending arms 144, one for each column, which are arranged over the rear forked ends 107 of the detent levers 108. It also carries corresponding forwardly extending arms 145 arranged under or within the rearwardly extending arms 141 of the pawl 137. hen

the bar is rocked backward the arms 144 and 145 act to disengage the detents 108 and pawl 137 from each lantern wheel and ratchet, and leave the whole accumulator, mechanism free from said detents'and pawls for the purpose of cancellation or resetting. The rock bar 142 is provided with a forwardly extending crank arm 146, which is engaged by the forked end 147 of a link 148. The lower end of this link is pivoted at 50 to the forward arm of one of the release bar levers 49, so that at the'beginning of the movement of the canceling actuator the bar 142 is rocked and the accumulator of each e r-lumn released, as above described, in'case any detent 108 is in engagement with its lantern wheel. end 123 from the cross bar 124.

The accumulator release bar 142 may be used to disengage the locks above described, excepting the key locks which hold up the actuators, so that the machine can be used free from said locks, if desired. But even a skilled operator will ordinarily prefer the feeling of confidence, that the machine will immediately notify of ,any error, and will use all of the locks which I have described. He is thereby able to give all of his attention to his work and have no care for what the machine is doing.

149 is a key mounted in'the top plate and adapted to be depressed to rock the bar142 backward. The key may then be turned a quarter of a revolution to engage a projection 150 on the key stem under a'fixed part 151 on the frame.- The machine may then be used without action of the detent 108 an pawl 137.

In the canceling operation the preliminary downward movement of the cross bar 57 first dc resses the auxiliary levers 86 by-means o projections 86 thereon, thereby detaching the locking hooks 83 from the actuator hooks 82, so that the actuators are free to perform their usual functions in canceling. If, the actuators being locked up in all columns but one, or in all columns,

an operator should desire to cancel or reset the accumulator mechanism, he could first depress the actuator release key 134 to retract the hooks 132. But I provide an automatic means to retract the said hooks, which are operated by the canceling actuator, so that the operator may simply 0p-.

Also it releases the lever erate the canceling handle without any attention to the preliminary releasing of the actuators. y

152 is a projection or hook attached to a suitably moving part of th canceling mechanism. It is conveniently attached to the lever 49 and extends over the cross rod 135, and is timed and located so that at the begin: ning of the canceling operation, before the cross bar 57 depresses the actuators, the hook 152 will depress the said rod 135 and rock the rod 130 upward, lift the 'tails of the hooks 132 and withdraw the latter from the corresponding hooks 133 of all of the locked actuators.

The canceling rock shaft 52 is formed with recesses 153 (Figs. 5 and 10) in which are situated vertical arms 154 on the links 95. As these arms move forward, on the depression of the auxiliary levers 86 by the cancellation cross bar, they are followed up by the full diameter portions of the shaft 52 in line with the recesses 153, which full diameter portions act as cams, and may assist in throwing forward the links 95 to unlock the actuators, and which hold the hooks 83 forward until the end of the canceling operation.

With the above described or other suitable accumulator mechanism I combine oiling means of improved character.

155 indicates slots formed in the frame or division plates 1 at the front of the accumulator mechanism. In these slots is removably fixed a transverse supporting and oilconducting bar 156 which is formed with upwardly and downwardly extending arms 157, 158 and 159, There is or may be a set of such arms for each order or column of mechanism. The arms 157 are elastic, as of spring metal, and extend upward and contact with a casing or covering plate 160, whichmay'be a part of the exterior casing of the machine and a continuation of the top plate 2. Preferably the plate 160 isseparable from the rest of the casing. This plate is formed with perforations 161 opposite to and yieldingly closed by the arms 157. The'arms 158 extend downward close to the teeth of the intermediate gears \24 and are adapted to conduct and deliver oil thereto. The arms 159 extend down to near the carrying gears, and have a similar oil-conducting and delivering function. The nozzle of the oiling can or device is inserted -into the perforations or oil holes 161, pushingback the yielding spring arms 157, and oil is expressed on to the said arms; from thence the oil'flows or spreads downward on to the bar 156, laterally along the bar, and down along the arms 158, 159, to be delivered to the said gears. The arms onthe bar areso arranged that the greater part ofthe oil flows on to the arms 158, which are shorter and more directly below the arms 157, and is dist-ributed to the gears 24 and their connected gearing. These rotary parts disseminate the .oil throughout the accumulator mechanism. When the-nozzle of the oil can is withdrawn the arms 157 spring back against the inner face of the plate 160, cover the perforations IP61 and exclude dirt and dust from the mechanism.

It will have been observed from the foregoing that the calculating machine described contains in operative combination key-stroke error preventing devices which may be for convenience divided into the two classes of normal and incidental. The normal lock is always in engagement to prevent errors except when the safety point has been reached, or when the accumulating operation is actually being performed. he incidental locks are not in at ual engagement except in cases of erron keyunanipulation.

The no. ial lock is a key-lock which prevents the depression of any two keys in different columns by a single finger action. The incidental locks comprise the partial depression lock for the column actuators, acting also, through the column actuators, on the accumulator mechanism, whereby a reverse movement of the column actuators is prevented after the beginning and before the end of the first reciprocation of a key; also the lock for actuators in other colunms, whereby the accumulator mechanism is preventedfrom being affected by the actuation of anykey in such columns until the error arising from a partly depressed key has been corrected; also, the accumulator lock whereby the accumulator mechanism is prevented from being actuated, during normal key action, except during the additive movement of the actuator; also, the upstroke lock, which holds the accumulator mechanism from additive movement whenever a properly and completely depressed key is attempted to be redepresscd before it has risen to normal position. The above described incidental. locks act ultimately on thekeys also, to guard or positively prevent them from causing erroneous accumulations.

Errol results, or may result, from a reverse movement of a key during either of its two reciprocations; from an upward movement (with or without a following downward movement) when it should be moving continuously downward, or from a downward movement when it should be moving continuously upward. The result of either 0 0th of such reverse movements may beflto'hiake an erroneous accumulation in exccss' bf or less than what is intended and would be correct. Either reverse movement may give Qnfeor more digits in excess of a correct result. If the actual additive movement of the accumulator mechanism occurs while the key is being depressed a mere reverse movement of the key atthis time would give too small an accumulation, but such reverse movement might be followed by a complete depression of the ,key, which, together with the additive movement which preceded the reverse, would give too great an accumulation. If the actual additive movement of the accumulator mechanism occurs while the key is rising (which is the case in the particular machine illustrated), a reverse movement or re-depression of the key will prepare for an extra and erroneous addition when the key again rises from its second low point. Such reverse movement of the keys, and the errors arising therefrom, are prevented by the locking mechanism, herein described. The keys are preliminarily and normally locked and guarded against operating simultaneously the mechanism in two columns by a single finger carelessly placed between two columns so as to press on keys in'both columns; after a key is properly released from its normal lock it is guarded during its first movement by the partial-depression reverse lock; and after the end of its first movement it is guarded during its second movement by the return, or up stroke, reverse lock.

The locking devices above described guard against other serious errors which have heretofore arisen from mismanipulation of the keys. Among such errors, which are prevented by the accumulator lock, was the partial depression of a key, not intended to be depressed but caught by the finger nail or front part of the finger, or by another finger, in the attempt to depresstthe key in the same column and immediately in front of such partially depressed key, which was immediately followed by the complete'depression of the intended key in front. This gave the intendedaegistry, augmented by one or more digits due to the said partial depression of the rear key, the total registry being erroneous.

The wings at the sides of the key button, above described, prevent erroneous mani u lat-ion by a finger engaging at once keys side by side. It was not advisable to apply such wings across the front and rear edges of .the key buttons, because they would offer obstacles to rapid key work, But the described accumulator lock in combination with the side wings afi'ords an eflicient guard,

in effect, for the whole circumference of the' key. The said locks are of great use in preventing errors which might otherwise be committed during any attempted single key registry. But when the machine is duplex in character, and the carrying mechanism is such that it permits prime actuations of the keys and adding mechanism in any two or more orders simultaneously, it is especially necessary to guard such duplex mechanism by the said partial stroke lock and upstroke lock, on accountof unequal pressure and extent of movement in several fingers operating simultaneously on difierent keys, and the operators unconsciousness of such inequality and the resulting errors.

In multiplication, where several ke s repsenting the multiplicand, or a part t ereof, are depressed together and repeatedly, and especially in'rapid work, the operator may not use even pressure in all fingers and may notkeep up such even pressure continuously, during his repetitions, and is unconscious of the fact. Some finger may completely de press its key but another finger or fingers may not do so.' In former machines, under such conditions, keys not fully depressed, and keys fully depressed but redepressed before-they had completely risen, would give a registry not intended and erroneous; but the errors were not evident and were unknown to theoperator. By the present invention, however, the partial depression lock and upstroke lock combine to guard against errors from simultaneous and uneven fingerpressure; the former, preventing any registry, notifies 0r signals the fact and allows'a second and complete depression to give only the correct registry, where the finger pressure has been too weak; and the latter preventing any addition to a correct registry, where the finger pressure is too strong and allows some keys to completely rise to normal, but not all,and redepression is attempted before full return to normal of all the keys. From a nervous action of the hand or finger, or other cause, there may be a reverse movement, prior to the completion of the entire stroke, given to a key singly operated, during each of its reciprocations; and such two reverse movements are more likely to occur in duplexin'g, as in multiplication, from unequal extent of movement among several fingers; and the entire looking mechanism, comprising the partial stroke and up-stroke locks, .is necessary to prevent erroneous accumulation by a key so operated. The said locks also require the key 'to overcome successive spring pressures, as already mentioned. These pressures are not of such amount as to perceptibly increase the resistance of the key to depression. While they do in fact add to the resistance of the key, the feeling of theo erator is one of greater ease of'operation o the machine, because the springs serve to cushion the key buttons for the fingers-of the operator, which is very material to ease of key action, espe- 'cially in continued use o'fthe machine; also said spring pressures cushion or retard the key against too much .of a shock when it is arrested at its full depression, and diminish such shock; thus saving wear and fatigue to the operator.

In the particular construction illustrated the adding mechanism, which is actuated or ari'ven by the keys, include: column actuator mechanism, which comprises column actuators and column actuator transmisslon dethe', accumulator mechanism, comprising nu meral wheel mechanism and carrying mech anism; In the illustration, the column actuator is exemplified bythe segment lever, and the said transmission devices by the pinion or gear with which said lever meshes and the ratchet wheel fixed to the pinion; but it will be understood that the invention is not confined to the employment of the particular devices set forth.

It is convenient to consider the accumulator mechanism herein as consisting of the parts whose movements are cumulative and preserve the result of the entire calculation, as distinguished from mere actuator mechanism which communicates motion to the accumulator mechanism and then returns to normal. 'With such understanding, the accumulator mechanism comprises, in the machine illustrated, the successively connected and co-acting parts from the ratchet'pawls to the numeral wheels, inclusive. The above terms have not always been heretofore used with entirely the significance ab'ove given to them for convenience in this specification.

In the present exemplification of the invention the normal lock for the keys acts directly on the column actuators and through them on the keys, and thus locks and secures from operation all of the mechanism which the keys, if not mismanipw latcd, would set in motion. The lock which operates on partial depression and release of a key acts directly on the accumulator, and through the accumulator on the column actuator to hold it against return until the error has been corrected by. a complete depression of the said key; it thus guards or prevents the said key from causing an erroneous accumulation; an extension of this locking mechanism to the keys of other columns causes the column actuators to be locked directly, and the keys tobe looked through the media of the column actuators. The upstroke lock, to prevent redepression after a full down stroke of a key and before its return to normal, acts directly on the accumulator driving ratchet, and through said ratchet locks the accumulator, or keeps it inactive, and through the ratchet, its driving pinion and the column actuator, locks the key against such redepression.

It will be understood that features of my invention are capable of independent use and .may separately be employed" in ,calculating machines. For example, parts of the looking mechanism may be omitted so that the said upstroke lock may be separately used; and the partial stroke lock ma be used in combination with the upstroke ock without the extension of the former to the locking of keys 'in other columns; and such features of vices; the adding mechanism also includes my invention are separately claimed herein, and otherwise than in a combination of all features.

hat- I claim is- 1. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral Wheels and -carrying me hanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the several orders of the said adding mechanism; and two reverse locking mechanisms guarding such keys against unis-manipulation during its first movei'i'ient and during its return movement, respectively, the look ing being operable by a plurality of keys manipulated sinmltaneously in separate orders, and being ordinally controlled by a single keyin each of said orders substantially as specified.

2. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral Wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuatingthe several orders of the said adding mechanism; two reverse locking mechanisms guarding such keys against uns-manipulation, during its first movement and during its return movement, respectively, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally'controlled by a single key in each of said orders; and a normal locking mechanism acting directly on the keys to prevent the simultaneous operation of the mechanisms in different columns by a single finger, the unlocking of said normal locking mechanism acting to position the parts for the operations of the said reverse locking mechanisms during the further movements of the keys; substantially as specified.

3. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism; and lockin mechanism adapted to lock a key, after lts addmg movement, against a further adding movement until the key has been restored to normal position, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

4. In a multiple-order key-driven calculating machine, in combination: adding $..-1niechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the adding mechanlsm in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism; and locking mechanism which is adapted to lock a key, after a complete adding movement thereof, against a further adding movement, which look is released upon the return of the key to normal position, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

5. In a nmltiple-order key-driven calculat-ing machine, in combination: adding mechanism including numeral Wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders sii'nultaneously; dcnominational series of keys for actuating the said adding mechanism; and ordinal looking mechanism adapted to lock a key subsequent to its complete depression and during its rising movement, against a reverse adding movement, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

6. In a multiple-order key-driven calculating machine, in combination: addin mechanism including numeral Wheels an carrying mechanism adapted to permit.

prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys. for actuating the said adding mechanism; locking mechanism comprising devices adapted to lock a key, after a complete adding movement thereof, against a further adding movement, and Which releases the key upon its return to normal position; and devices adapted, on partial depression and release of a key, to lock the keys in other columns of the said adding mechanism against depression; and means for releasing the latter eys, the locking being operable by a pluralitv of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key ineach of said orders; substantially as specified.

7. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral Wheels and carrying mechanism ada ted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism; column actuators comprised in said adding mechanism;

locking mechanism comprising devices adapted to lock a key, after a complete adding movement thereof, against a furtheradding movement, and which releases the key upon strokes of the keys and are adapted, on par-.

tial depression and release of a key, ,to lock the keys in other columns of the said adding nmchauism against depression; and means for releasing the latter keys, the locking be- 4 ing operable by a plurality of keys manipulat ed simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as 8. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism; an auxiliary lever actuatable by the depression of a key; a part movable longitudinally and vertically which is actuated by the said auxiliary lever; means whereby the said movable part causes the keys in other columns of the said adding mechanism to be locked against further depression when a key 'is partially depressed and released; and means whereby the said movable part causes a key to be locked against re-depression when it has been completely depressed and has partly returned to normal position, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

9. In a multiple-order key-driven calculating machine, in combination: accumulator mechanism including numeral wheels: denominational series of keys for actuating the said accumulator mechanism; a lever actuatable by the depression of aakey: means whereby the said lever causes the keys in other columns to be locked against depression when a key is partially depressed and released; and means whereby the said lever causes a key to be locked against re-depression when it has been completely depressed but has not returned to normal position: substantially as specified.

10. In a multiple-order key-driven calculating machine, in combination: accumulator mechanism including numeral wheels; denominational series of keys for actuating the said accumulator mechanism; a longitudinally movable and tilting lever actuatable by the depression of a key; means whereby the said lever causes the keys in oth r columns to be locked against depression when a key is partially depressed and released; and means whereby the said lever causes a key to be looked a ain'st I e-depression when it has comp eteiy depressed but has not returned to normal position; substantially as specified.

11. In a multiple-order key-driven (Ea-1c? lating machine, in combination: accumulator mechanism including numeral wheels; denominational series of keys for actuating the said accumulator mechanism; an auxiliary lever actuata'ble by the depression of a key; a longitudinally movable and tilting lever which is actuated by the said auxiliary lever; means whereby the second lever causes the keys in other columns to be locked against depression when a key is partially depressed and released; and means whereby the second lever causes a key to be locked against re-depression when it has been completely depressed but has not been allowed to return to normal position; substantially as specified.

12. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and v carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; de-v nominational series of keys for actuating the said adding mechanism; and two reverse locking mechanisms guarding a key against miss-manipulation during its first movement and during-its return movement, respectively, one of said locking mechanisms acting on the adding mechanism independently of the key, the locking be -inn operable by a plurality of keys manipu ated simulta neously in separate orders, and being ordinally controlled by a single key in each. of said orders; substantially as specified.

13. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism; and two reverse locking mechanisms guarding a key against mis-manipulation during its first movement and during its return movement, respectively. both of said locking mechanisms acting on the adding mechanism independently of the key; substantially as specified.

14. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; denominational series of keys for actuating the said adding mechanism and means. for looking the adding mechanism after a complete additive movement. of a key anduntil the key returns to normal position, which looking means is caused to operate by the-key of the same, the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

1-5. In a multiple-order key-driven calcu lating machine, in combination: adding mechanism includingnumeral Wheels and carrying me hanism adapted to permit prime actuations of the adding mechanism in a plurality of orders simultaneously; de-

nominational series of keys for actuating the said adding mechanism; and means for looking the adding mechanism after a complete additive movement of a key and until the key returns to normal position, said locking means operating on an actuating member common to an ordinal series of keys; the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of said orders; substantially as specified.

16. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral ivheels and carrying mechanism adaptedv to permit prime actuations of the adding mechanism in a pluralityof orders simultaneously; denominational series of keys for actuating the said adding mechanism; two reverse locking mechanisms guarding a key against. nus-manipulation during its first movement and during its return movement, respectively, both of said locking mechanisms acting on theaddi'ng mechanism independently of'the key; and a normal locking mechanism acting directly on the keys to prevent the simultaneous operation of the mechanisms in different columns by a single finger, the un- 40 locking of said normal locking mechanism acting to position the parts for the operations of the said reverse locking mechanisms during the further movements of the, keys; substantially as specified.

17. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral wheels and carrying mechanism adapted to permit pri e actuations of the adding mechanism in a plurality of orders simultanemisly; de-

nominational series of keys for actuating the said adding mechanism; a driving, ratchet comprised in the said adding mechanism: and locking means applied to the said ratchet for guarding the keys against mismanipulation; the locking being operable by a plurality of keys manipulated simultaneously in separate orders, and being ordinally controlled by a single key in each of snssaidorders; substantially as specified.

v 18. In a multiple-order key-driven calculating machine, in combination: actuating means and transmission devices; accumulatonmechanism including numeral Wheels; 66. deii'cil'linational series of keys for driving the sand actuating means; and locking mech- I anism for locking the accumulator mechanism after a complete additive movement of a key and until the key returns to normal position, said locking means operating on the transmission devices which drive the accumulator mechanism; substantially as specifled.

19. In a multiple-order key-driven calculating machine, in combination: actuating means and transmission devices; accumulator mechanism including numeral Wheels; denominational series of keys vfordriving the said actuating means; and locking mechanism for locking the accumulator mechanism after a complete additive movement of a key and until the key returns to normal position, said locking means operating on the ratchet which drives the accumulator mechanism; substantially as specified.

A 20. In a multiple-order key-driven calculating machine, in combination: accumulator mechanism including numeral wheels; denominational series of keys for actuating the said accumulator mechanism; column actuators by means of which the motion of a key is communicated to the accumulator mechanism; accumulator driving ratchets Which arecaused to be turned by the column actuators; and locking pawls acting on the said ratchets to prevent their "accumulatordriving movement after a key has been com-- pletely depressed and is attempted to be redepressed before it has returned to normal position; substantially as specified.

21. In a multiple-order key-driven calculating machine, in combination accumulator mechanism including numeral wheels and carrying mechanism adapted to permit prime actuations of the accumulator mechanism in a plurality of orders simultaneously'fdenominational series of keys and column'actuators for actuating the said accumulator mechanisms; and locking mechanism adapted to lock the column actuator and by means of the actuator to lock a key. after the additive movement of the key and before ithas been returned to normal position, the locking being operable by a p lu-.

rality of keys manipulated simultaneously in separate orders andbeing ordmally eontrolled by a single key in each of said or-.

ders; substantially as specified.

22. In a multiple-order key-driven calculating machine, in combination: adding mechanism including numeral Wheels and carrying mechanism adapted to permit prime actuations of the accumulator mechanism in a plurality of orders simultaneously;

denominational series of keys for actuating the said adding mechanism; and locking mechanism adapted to lock the column actuator of the adding mechanism and by means of the actuator to lock a key against redepression. after the complete depression of the 

